Ore-dressing machine.



i v PATENTED AUG. 1, 1905.

H. s. ANDERSON & J W. BENNIE.

ORE DRESSING MACHINE.

APPLICATION TILED FEB. 2,1905.

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UNITED STATES PATENT OFFICE.

HENRY S. ANDERSON, OF SPRINGFIELD, MASSACHUSETTS, AND JOHN W. BENNIE, OFCLIFTON, ARIZONA TERRITORY.

ORE:DRESSING MACHINE.

Specification of Letters Patent.

Patented Aug. 1, 1905.

Original application filed May 17, 1903, Serial No. 157,842. Divided andthis application filed February 2, 1905. Serial No. 243,830.

To all whom it may concern.-

Be it known that we, HENRY S. ANDERSON, residing at Springfield, Hampdencounty,Massachusetts, and JOHN W. BENNIE, residing at Clifton,Grahamcounty, Territory of Arizona, citizens of the United States, haveinvented certain new and useful Improvements in Ore- Dressing Machines,of which the following is a full, clear, and exact description.

Our invention relates to improvements in concentrating-jigs and similarapparatus, and has for its object to provide an ore-dressing machine inwhich expensive metallic screens are rendered more lasting without inany way interfering with the fundamental principles of construction oroperation of the apparatus.

The principle on which all forms of jigs work is the tendency of amixture of ore particles of approximate size but varying specificgravity to arrange itself in layers according to their specificgravities when given a motion of adjustment by means of a pulsatingcolumn of water or other concentrating liquid.

The'type of concentratingjig most generlly used consists of a.water-tank divided by tition in the upper part thereof, which L? notextend to the bottom. On one side the partition is fixed a horizontalmetallic .reen on which the sized ore is fed. On the other side of thepartition is a loosely-workmetallic screen, so affecting the particlesof ore resting thereon that the heavier particles settle down throughthe lighter and either discharge through the screen itself or by asuitable gate above the screen-level, while the lighter particles ofrock move on horizontally, discharging over the side or end of thescreenframe. The metallic screens mentioned above are subject to greatwear, partly due to the abrasion of the ore and partly to the corrosiveaction of acids, alkalies, or metallic salts present in the water usedas a concentrating medium, and it is the object of our invention toprevent such wear. We accomplish this by making the screen the cathodeor electronegative element of an electrolytic bath, substan: tially asshown in the drawings, made apart of this application.

In the drawings, Figure 1 is a vertical section of a concentrating-jigembodying our invention. Fig. 2 is a plan view of the same.

Referring more particularly to the drawings, A is the tank containingthe water or other concentrating liquid, which when ore is being treatedcontains acids and metallic salts derived from the ore. B is a partitionin the upper part thereof extending toward the bottom and braced by across-bar B.

C is the metallic ore-bed screen, upon which the ore to be concentratedis deposited.

D is the plunger or piston working on the other side of the partition Bwith a reciprocating motion derived from the eccentric E upon the shaftE.

F is a dischargepipe normally closed for drawing off the concentratingliquid.

G is a slanting bottom in the tank.

H is an electrode located below the screen C. The electrode H is of somematerial such as graphite or other suitable conducting material and isconnected to one terminal of an external source of continuous currentK,while the screen is connected to the other terminal of said source insuch a way that the screen becomes the cathode or electronegativeelement and the electrode H the anode or the electropositive element.With this arrangement the screen is protected against corrosion,hydrogen being set free at its surface and the metallic salts in thesolution being decomposed, so that the metal is electrolyticallydeposited upon the screen. When the concentrating liquid containssulfuric acid and sulfate of copper, as is the case when treating orescontaining sulfid of copper, such acid and salt being produced by theaction of water in the liquid upon the ores, copper is electrolyticallydeposited upon the screens. This deposit is formed in opposition to theabrasive action of the ore, and to the extent of the deposit theabrasive action on the original screen is reduced, while the deposit onparts not subject to abrasive action builds up and strengthens thescreen. By this means we are able to protect the screen entirely fromelectrolytic corrosion and also to reduce the loss due to abrasiveaction.

We have found that our invention makes it possible to use steel-wire orpunched-steel screens, many times less expensive than brass or copper,and that when brass and copper screens are used the life of such screensis materially increased.

We have used ourinvention particularly in ore-dressing machines used fortreating sulfate of-copper ores and have found it of great value in thatconnection.

This application is a division of our former application, Serial No.157,842, filed May 19, 1903- What We claim is 1. In an ore-dressingmachine, the combination of acontaining vessel, a metallic orebed screentherein forming an electrode, an electrolytic liquid containing insolution a salt of the metal of the ore treated and submerging saidscreen, means for causing said liquid to pass and repass through saidscreen, a second electrode in said vessel submerged in said liquid, anda source of electric current having its terminals connected to saidelectrodes, respectively, so as to maintain said screen in anelectronegative condition relatively to said second electrode.

2. In a concentrating-jig, a metallic orebed screen, a carbon electrode,a concentrating liquid, said screen and electrode being so located as tobe submerged by the concentrating liquid, said liquid containing insolution a salt of the metal of the ore treated, and a source ofcontinuous current having its terminals connected to said screen andsaid electrode, respectively, so as to maintain said screen in anelectronegative condition rela tively to said carbon electrode.

Signed at New York city, New York, this 31st day of January, 1905.

HENRY S. ANDERSON. JOHN W. BENNIE. Witnesses:

A. G. SHAW, A. HOWARD.

It is hereby certified that in Letters Patent No. 796,390, grantedAugust 1; 1905,

upon the application of Henry S. Anderson, of Springfield,Massachusetts, and John W, Bennie, of Clifton, Arizona Territory, for animprovement in Ore-Dressing Machines, an error appears in the printedspecification requiring correction, as follows: In the heading the wordsand figures Original application filed May 17, 1903, should readOriginal application filed May 19, 1.903; and that the said LettersPatent should be read with this correction therein that the same mayconform to. the record of the case in the Patent Oifice.

Signed and sealed this 23d day of January, A. 1)., 1906.

[SEA 1..]

F. I. ALLEN,

or copper, and that when brass and copper screens are used the life ofsuch screens is materially increased.

We have used ourinvention particularly in ore-dressing machines used fortreating sulfate of-copper ores and have found it of great value in thatconnection.

This application is a division of our former application, Serial No.157,842, filed May 19, 1903- What We claim is 1. In an ore-dressingmachine, the combination of acontaining vessel, a metallic orebed screentherein forming an electrode, an electrolytic liquid containing insolution a salt of the metal of the ore treated and submerging saidscreen, means for causing said liquid to pass and repass through saidscreen, a second electrode in said vessel submerged in said liquid, anda source of electric current having its terminals connected to saidelectrodes, respectively, so as to maintain said screen in anelectronegative condition relatively to said second electrode.

2. In a concentrating-jig, a metallic orebed screen, a carbon electrode,a concentrating liquid, said screen and electrode being so located as tobe submerged by the concentrating liquid, said liquid containing insolution a salt of the metal of the ore treated, and a source ofcontinuous current having its terminals connected to said screen andsaid electrode, respectively, so as to maintain said screen in anelectronegative condition rela tively to said carbon electrode.

Signed at New York city, New York, this 31st day of January, 1905.

HENRY S. ANDERSON. JOHN W. BENNIE. Witnesses:

A. G. SHAW, A. HOWARD.

It is hereby certified that in Letters Patent No. 796,390, grantedAugust 1; 1905,

upon the application of Henry S. Anderson, of Springfield,Massachusetts, and John W, Bennie, of Clifton, Arizona Territory, for animprovement in Ore-Dressing Machines, an error appears in the printedspecification requiring correction, as follows: In the heading the wordsand figures Original application filed May 17, 1903, should readOriginal application filed May 19, 1.903; and that the said LettersPatent should be read with this correction therein that the same mayconform to. the record of the case in the Patent Oifice.

Signed and sealed this 23d day of January, A. 1)., 1906.

[SEA 1..]

F. I. ALLEN,

eorrection in Letters Patent No. 796,390.

It is hereby certified that in Letters Patent No. 796,390, grantedAugust 1, 1905, upon Lhe application of Henry S. Anderson, ofSpringfield, Massachusetts, and John WY Bennie, of Clifton, ArizonaTerritory, for an improvement in Ore-Dr-essing Machines, an errorappears in the printed specification requiring correction, as follows:In the heading the words and figures Original application filed May 17,1903," should read Original application filed May 19.1908; and that Lhcsaid Letters Patent should he read with [his correction therein that thesame may conform to the record o1 [lm case in the Patent, ()flice.

Signed and sealed this 23d day of January A. D., 1906.

[52min] F. I. ALLEN,

( fummissinner of Patents.

